After the world saw the shocking video of Solange attacking her sister’s husband, Jay Z, in an NYC elevator, Solange begged Beyonce to go public and ‘speak up on her behalf.’ When Beyonce refused, her little sis took revenge by deleting practically all of the pics of Beyonce on her Twitter and Instagram accounts, an insider reveals to HollywoodLife.com EXCLUSIVELY.

Not surprisingly, Solange has been getting tons of heat for going ballistic on Jay Z following a Met Gala after-party at the Standard Hotel on May 5. Solange was expecting her big sister to stand up for her in her time of need, but Beyonce has stayed mum on the whole situation.

“Solange is upset and feels betrayed that Beyonce didn’t come to her defense when footage of the elevator fight went viral,” an insider tells HollywoodLife.com EXCLUSIVELY. “She wanted Beyonce to speak up on her behalf and say something like, ‘Don’t assume anything.'”

Of course, we all know that Beyonce is super private about her personal life and it looks like she’s not going to make an exception this time — even for her sister.

“Beyonce refused to talk about the incident and Solange’s way of letting B know that she’s ticked off is by deleting photos on her Instagram,” the source adds. “She knows B knows the truth about what happened that night.”

“Solange doesn’t like the way Jay Z controls Beyonce. Beyonce would never speak up to him or defend herself, so Solange does it. Solange is not afraid of him and is fed up with him calling all the shots in Beyonce’s life,” a source told us EXCLUSIVELY.

And that’s not all — Solange was also furious with Jay Z about his “too close” relationship with designer Rachel Roy, another source told HollywoodLife.com EXCLUSIVELY.

“Solange was defending Beyoncé in the elevator because Solange finds Jay’s friendship with Rachel to be WAY too close for comfort and it makes Solange very uncomfortable,” the source revealed.

So what do YOU think, HollywoodLifers? Should Beyonce have come to Solange’s defense? What would YOU have done? Let us know.